Thread (26 messages) 26 messages, 7 authors, 2006-07-02

Re: [PATCH 0/2] NET: Accurate packet scheduling for ATM/ADSL

From: Andy Furniss <hidden>
Date: 2006-06-14 15:31:54

jamal wrote:
I have taken linux-kernel off the list.

Russell's site is inaccessible to me (I actually think this is related
to some DNS issues i may be having) and your masters is too long to
spend 2 minutes and glean it; so heres a question or two for you:

- Have you tried to do a long-lived session such as a large FTP and 
seen how far off the deviation was? That would provide some interesting
data point.
- To be a devil's advocate (and not claim there is no issue), where do
you draw the line with "overhead"? 
Me and many others have run a smilar hack for years, there is also a 
userspace project still alive which does the same.

The difference is that without it I would need to sacrifice almost half 
my 288kbit atm/dsl showtime bandwidth to be sure of control.

With the modification I can run at 286kbit / 288 and know I will never 
have jitter worse than the bitrate latency of a mtu packet. The 286 
figure was choses to allow a full buffer to drain/ allow for timer 
innaccuracy etc. On a p200 with tsc, 2.6.12 it's never gone over for me 
- though talking of timers I notice on my desktop 2.6.16 I gain 2 
minutes a day now.

Andy.
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